CN205063929U - Colliery is sealed in pit and is pressed integration segmentation hydraulic fracturing device - Google Patents
Colliery is sealed in pit and is pressed integration segmentation hydraulic fracturing device Download PDFInfo
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- CN205063929U CN205063929U CN201520770574.7U CN201520770574U CN205063929U CN 205063929 U CN205063929 U CN 205063929U CN 201520770574 U CN201520770574 U CN 201520770574U CN 205063929 U CN205063929 U CN 205063929U
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- CN
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- Prior art keywords
- coiled tubing
- capsule
- fracturing
- pressure
- separate
- Prior art date
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- 230000011218 segmentation Effects 0.000 title claims abstract description 13
- 239000002775 capsules Substances 0.000 claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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Abstract
Description
Technical field
The utility model relates to the technical field of the integrated segmentation fracturing device of a kind of underground coal mine envelope pressure.
Background technology
The a large amount of gas produced in adjoint progress of coal mining constitute great threat for the safety in production in colliery.All the time, coal production technician is being devoted to reduce the Gas work in progress of coal mining.Pre-mining drainage coal-bed gas is the important means that China administers gas problem at present.But China's Permeability Coefficent in Coal Seam is general lower, and general pre-mining drainage is difficult to reach desirable extracting result.
At present, before gas pumping, fracturing is carried out to coal seam and progressively obtain large-scale application as the anti-reflection technology in the effective coal seam of one in more place.But, existing fracturing is generally only carry out once full borehole fracturing to boring, the method for sealing of its correspondence is exactly by after entering boring under fracturing string, in aperture packer or cement mortar or polyurethanes chemical grout annular space shutoff aperture, water under high pressure is easy to coal seam weak place in boring and opens a large amount of crack, even close on to hole along a major fracture and other and to link up and unsatisfactory to the antireflective effect in other not easily places of pressure break, this makes the Permeability Coefficent in Coal Seam of boring local location do not improved largely, reduce the pressure break efficiency of single hole, if later stage gas pumping is insufficient, in progress of coal mining, be easy to occur that local gas is gushed out excessive phenomenon, the lack of uniformity of this antireflective effect seriously governs the application popularization of hydraulic fracturing technology.In addition, the method that pressure break is holed entirely requires that fracturing unit can provide larger pressure break discharge capacity, higher liquid filling pressure, therefore this makes the fracturing unit of down-hole bulky, system complex, and is not suitable with the feature that underworkings is narrow, working space is limited.
Therefore, invention one can shorten pressure break segment length, and the crack that coal seam is opened is more even, improves pressure break efficiency, better adapts to pressure break and the method for sealing of the operating feature of down-hole, becomes the key promoting hydraulic fracturing technology application.
Summary of the invention
The purpose of this utility model is to overcome the deficiency in above-mentioned technology, provides a kind of structure simple, easy to operate fracturing device.
The technical solution adopted in the utility model is: the integrated segmentation fracturing device of a kind of underground coal mine envelope pressure, comprises opening anchor, the first packing capsule, one way valve, the second packing capsule that coiled tubing sets gradually.
Described coiled tubing passes first, second packing capsule centre and divides in capsule and has weep hole.
Described coiled tubing outer end is connected to fracturing pump, and end is provided with plug.
Described packing capsule is fixedly connected with by high pressure pipe collar and protrusion-dispelling packing ring with coiled tubing.
Described one way valve is provided with two symmetrical liquid injection holes, screwed connection between one way valve and coiled tubing.
Described one way valve starting pressure is 5MPa.
Compared with traditional single hole once full boring and hydraulic fracture mode, the utility model adopts the mode of two packing capsule series connection that whole boring is separated into multistage, pressure is concentrated on a bit of upper pressure break at every turn, then fracturing is carried out piecemeal according to a certain order, because acting surface is more concentrated, make the gap of opening in coal seam more even, substantially increase pressure break efficiency, also reduce discharge simultaneously, thus the requirement reduced frac system, equipment volume is reduced greatly, the tunnel condition of down-hole can be adapted to better, workable, be convenient to Technique Popularizing.
Accompanying drawing explanation
Fig. 1 is the structural representation before pressure break of the present invention.
Fig. 2 is the post-fracturing structural representation of the present invention.
In figure, 1-coiled tubing, the 2-the first packing capsule, 3-one way valve, the 4-the second packing capsule, 5-weep hole, 6-high pressure pipe collar, 7-screw thread, 8-liquid injection hole, 9-fracturing pump, 10-opening anchor, 11-plug, 12-boring.
Detailed description of the invention
As shown in Figure 1, the integrated segmentation fracturing device of a kind of underground coal mine envelope pressure, comprises opening anchor (10), the first packing capsule (2), one way valve (3), the second packing capsule (4) that coiled tubing (1) sets gradually.
Especially, coiled tubing (1) is through dividing in capsule and have weep hole (5) in the middle of first, second packing capsule.
Especially, coiled tubing (1) outer end is connected to fracturing pump (9), and end is provided with plug (11).
Especially, packing capsule is fixedly connected with by high pressure pipe collar (6) and protrusion-dispelling packing ring with coiled tubing (1).
Especially, one way valve (3) is provided with two symmetrical liquid injection holes (8), and between one way valve (3) with coiled tubing (1), screw thread (7) is connected.
Especially, one way valve (3) starting pressure is 5MPa.
As shown in Figure 2, when the present invention works and other underground fracture equipment with the use of.First, boring (12) interior precalculated position will be entered under fracturing string, open fracturing pump (9), water under high pressure enters in the first packing capsule (2) and the second packing capsule (4) by the weep hole (5) of (1) on coiled tubing, water under high pressure makes the expansion of packing capsule set, with drill hole wall close contact, between two packing capsules, form confined space.Along with the rising of pressure, after high-pressure water pressure in coiled tubing (1) reaches the starting pressure 5MPa of one way valve (3), one way valve (3) valve opening, water under high pressure enters in the enclosure space of packing capsule formation by the liquid injection hole (8) of one way valve (3), along with the continuous increase water under high pressure pressure break coal seam of liquid filling pressure, open in coal seam, expand newborn crack, link up, extend secondary fracture.After pressure break completes, close fracturing pump (9), packing capsule deblocking, after carrying a pressure break unit outside fracturing string, repeat above-mentioned steps until complete the fracture job of whole boring (12).
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520770574.7U CN205063929U (en) | 2015-10-08 | 2015-10-08 | Colliery is sealed in pit and is pressed integration segmentation hydraulic fracturing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520770574.7U CN205063929U (en) | 2015-10-08 | 2015-10-08 | Colliery is sealed in pit and is pressed integration segmentation hydraulic fracturing device |
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| CN205063929U true CN205063929U (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520770574.7U CN205063929U (en) | 2015-10-08 | 2015-10-08 | Colliery is sealed in pit and is pressed integration segmentation hydraulic fracturing device |
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| CN (1) | CN205063929U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891001A (en) * | 2016-04-11 | 2016-08-24 | 中南大学 | Test device for segmented loading and unloading in rock pores |
| CN108643877A (en) * | 2018-05-21 | 2018-10-12 | 中国矿业大学 | Coal mine underground coal bed long drilled holes staged fracturing is anti-reflection and mash gas extraction method |
| WO2019196503A1 (en) * | 2018-04-12 | 2019-10-17 | 山东科技大学 | Drilling machine power-based downhole rapid slotting directional hydraulic fracturing system and method |
-
2015
- 2015-10-08 CN CN201520770574.7U patent/CN205063929U/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891001A (en) * | 2016-04-11 | 2016-08-24 | 中南大学 | Test device for segmented loading and unloading in rock pores |
| WO2019196503A1 (en) * | 2018-04-12 | 2019-10-17 | 山东科技大学 | Drilling machine power-based downhole rapid slotting directional hydraulic fracturing system and method |
| CN108643877A (en) * | 2018-05-21 | 2018-10-12 | 中国矿业大学 | Coal mine underground coal bed long drilled holes staged fracturing is anti-reflection and mash gas extraction method |
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